You already have steps (or a ladder in the case of Oil Slick) to make it easier to get down to the water in many of the sites in the north and in the south, I can't believe divers walking on the beach have more impact than divers parking on the beach. Old Blue is a bit different in that there's a slight ledge or slope that must be navigated between truck parking and water entry. It's not difficult at all, until the coral rubble/sand gives way, and your boot sticks in place while the rest of your top-heavy self takes a fall. Spiral fracture to left fibula, took a plate and six screws to fix after we got home. The rest of the trip was, er, interesting. Bonaire isn't exactly ADA approved! (I had to promise, if we ever dive the site again, I'll carry her gear back and forth to the truck.)I do believe there would be less impact on the shore if steps or hand rails were installed! We have them at our Park at Catalina and they lessen the impact of divers entering and exiting everywhere! You could take 48" of shore and save the rest! 48" by 10ft of cement would not be bad for the environment or the divers!
I'd rather Bonaire get better wheelchair access before "fixing" the current dive site entries and legalizing something stronger than Advil and rum for people with really good medical reasons to be in pain would help too. Between BOPEC and sprawling Kralendijk and suburbs, there's enough development on that island already without pouring more cement over beautiful natural beaches.